Honing apparatus



June 10, 1941.

w. D. SCHMIDT HONING APPARATUS Filed, March 11, 19 6 I/l L'Zhdm D. Schmidt 3 mmfl III/11, 26

Patented June 10, 1941 .UNI'TED STATES PATENT OFFICE HONING APPARATUS William D. Schmidt, Worcester, Mass, assignor to The Heald Machine Company, Worcester, Mass, a corporation of Massachusetts Application March 11, 1936, Serial No. 68,290 I 2 Claims.

The present invention relates to honing apparatus for internal honing and is particularly adapted for the'finishing of tapered surfaces, as

for example, the inner surfaces of the outer simple and compact honing mechanism which can be readily applied to a conventional internal grinding machine; other objects are to provide for fluid pressure reciprocation of the honing elements, and to mount the latter resiliently.

Other and further objects and advantages of the invention will appear from the following detailed description taken in connection with the accompanying drawing in which- Fig. 1 is a plan view of honing apparatus in accordance with my invention, certain parts being removed and others being shown in section.

Fig. 2 is a fragmentary end view showing the honing elements of Fig. 1.

Fig. 3 is a sectional view along the line 33 of Fig. 1.

Like reference characters refer to like parts in the different figures.

Referring first to Fig. 1, the honing apparatus, indicated as a whole by the numeral l is arranged to operate upon the tapered surface 2 of a workpiece a during the latters rotation by any suitable workholder 3 which may have the form of any well known chuck in which the workpiece is suitably held, with the axis of the surface being honed concentric to the axis of rotation of the chuck. The honing apparatus of my invention is applicable especially to a machine having a reciprocatory table such as the usual Heald grinding machine, one example of which is disclosed in the Guild Patent No. 1,971,138, dated Aug. 21, 1934.

In the application of my invention to such a machine, either the honing mechanism I or the usual workhead which carries the rotary chuck 3 may be mounted on the reciprocatory table and the latters movement in one direction serves to position the honing elements and theworkpiece in operative relation. This table movement in the other direction serves for an axial withdrawal movement of the honing elements .relative to the workpiece to permit removal of the finished workpiece from'the chuck and the positioning of an unhoned workpiece therein.

The machine arrangements by which the ap-' proach and withdrawal movements of the hone preferably arranged on a suitable support 4 forming part of the device and adapted, as aforesaid, to be mounted either on the reciprocatory table or on the stationary base of the machine; the other of said machine elements (the base or the table, as the case may be) carries the usual head wherein is journalled the rotary workholding chuck 3.

As shown in Fig. 1, the support 4 carries duplicate honing instrumentalities for simultaneous operation on the tapered bore 2 of the rotating workpiece a; hence a description of one of these instrumentalities will sufiicefo'r both. Each device or instrumentality comprises a suitable.

bracket 5, adjustably secured .to the support 4 by bolts 6, 6 which pass through elongated arcuate slots 31, 31 of said bracket. In each bracket 5 is provided a longitudinally-extending bore or guideway 8, formed in part by a removable cap 6', Fig. 3 which is secured to the bracket by suitable screws or bolts 1, l; in Fig. 1 these cap portions 6' of the brackets 5 and 5' have been removed, in order to disclose more clearly the interior construction. Slidably supported in each bore or guideway 8 is a hone-carrying rod or spindle 9 or 3'.

Spaced collars l0 and II threaded on said rod or spindle and secured against rotation thereon,

' as by set screws I2, limit the movement'of the spindle endwise in its guideway 8 although permitting reciprocation of said rod for a stroke of a predetermined and adjustablelength. Midway between the collars HI and II each rod 8 or 9 is provided with an enlarged portion l3 forming a piston slidably received in an enlarged bore [4 or H of the associated bracket.

The end of each rod 9 or 9', adjacent the collar ID, has a recess 15 to receive a tapered projection IS on a member l1 which is removably secured to the rod as by a pin l8. The member I! has a flat spring I 9 attached thereto and projecting beyond the end thereof, and the end of the spring I 9 carries a lug 20 to which is pivotally connected a bar 2!, as by a pivot pin 22. A

.honing element in the form of astrip 23 of any suitable abrasive material is attached to each bar 2| by any desired means, as by adhesive. The'outer end of each honing strip or stick 23 or 23' is normally urged inwardly toward the axis of the workpiece by a spring 24 seated in a recess 25 of bar 21 and bearing against the lug 20. This inward displacement of the forward ends of the honing elements 23 and 23' enables them to enter freely within the workpiece bore 2.- Each spring I! provides the pressure exerted by its associated honing element against the workpiece, and the outward movement of said honing element by said spring I9 is limited, when the apparatus is withdrawn axially of the workpiece, by a set screw 26 adjustably positioned in the member H, the end of said set screw engaging with said spring.

For reciprocating the hone-carrying rod 9, fluid under pressure is supplied from a suitable source, not shown, to a reversing valve 21 in a casing 28, fluid entering said valve through a central port 29 connected by channels 30 to the outer portions of the valve. The valve casing has angularly spaced ports 3! and 32 connectedby pipes 33 and 34 respectively to the left and right hand ends of the cylindrical bore M. The casing 28 is also provided with exhaust ports 35 and 36 in the side of the casing and adjacent to the ports 3| and 32 respectively. When the valve 2! is continuously rotated, as by a suitable driving means, not shown, fluid under pressure is directed alternately to opposite ends of the bore l4 and the other end of the bore is simultaneously connected to the exhaust so that the rod 9 is given a reciprocation axially thereof to the extent determined by the adjustment of the collars l and II, this reciprocation resulting in a corresponding reciprocation of the honing element 23 over the tapered surface of the workpiece.

For adjustment of the honing device to accommodate it to varying degrees of taper, the openings 31 in the brackets 5 and 5, through which the bolts 6 extend, are in the form of armate slots. Each bracket is accordingly turnable on the support 4 to vary the angularity of its associated honing member relative to the axis of rotation of the workpiece.

The other honing element 23' is carried by its rod 9' in the same manner as the element 23, and is reciprocated by fluid under pressure through the same valve 21 which controls the reciprocation of element 23. For this purpose the casing 28 has angularly spaced ports 3| and 32 connected by pipes 33' and 34' respectively to the left and right hand ends of the cylindrical bore l4. Exhaust ports 35' and 3d are also provided in the casing 28 in alinement with the ports 3| and 32'. The valve 21 is so arranged that when fluid under pressure is directed to the left hand end of the bore I4, fluid under pressure is directed to the right hand end of the bore I4 so that the hones 23 and 23 are moved in opposite directions.

In operation, after the brackets 5 and 5 have been adjusted to give reciprocations of their associated rods 9 and 9' in directions substantially parallel to the tapered surface of the workpiece, the hones and the work by the table movement aforesaid are given a relative axial movement to bring the parts into operative relation to each other, as shown in Fig. 1. Since the valve 21 is continuously rotated the honing members are reciprocated back and forth over the surface of the workpiece during the rotation thereof and the desired finish is accordingly obtained on the workpiece. It will be noted that the amount of pressure exerted between the hones and the work is variable, depending upon the position of the brackets 5 and 5, a greater pressure being obtained by a greater spacing between said brackets. The flat spring members allow a resiliency between each hone and its support, and the pivotal mounting of the hone on the spring permits satisfactory operation of the device even if the adjustment of the brackets 5 is not exactly the equivalent of the taper of the workpiece. When the hones are withdrawn from the workpiece the outward movement cf the hones, as a result of the resiliency of the spring I 9, is limited, as above stated, by the set screw 26 in each member I1, thereby making possible the subsequent entry of the hones within the bore of an unhoned workpiece.

From the foregoing it will be apparent that the honing elements have a short relatively rapid reciprocation over the surface of the workpiece,

. thereby avoiding the formation of circumferential scratches, and that the several hones may be adjusted to adapt their reciprocations to different degrees of taper in successively honed workpieces.

I claim:

1. In a honing device, a hone, a spindle carrying said hone, fluid pressure means, including a cylinder and piston, one of which is connected to the spindle for reciprocating the latter, and means, including adjustable collars on the spindle, for limiting the length of the reciprocatory movement.

2. In a honing device, a spindle, a spring directly connected to the spindle at one end thereof, a hone on the other end of the spring, said spring providing the sole connection between the hone and the spindle, said spring normally urging the hone into work-engaging position, and means for limiting the extent of movement of the hone relative to the spindle by the action of the spring.

WILLIAM D. SCHMIDT. 

